LinuxQuestions.org - error in use a trust table that i added in aodv in ns2

hi
i have added a trust table like the routeing table in aodv routing protocol. by running this code i get a "segmentation error"
the code is :

Code:

trust_entry* trust_store::trust_lookup(nsaddr_t node_id)

{

  trust_entry *rp=trusthead.lh_first;

  for(;rp;rp=rp->trust_link.le_next){

    if(rp->node_id==node_id)

      break;

  }

  return rp;

}

this code is the same code in route table that lookup an entry in trust table. i have checked every thing and i am sure that in this case trust table is not empty , it show the 4 first entry but after that it get "segmentation error", (in this running ,before this error ,it show 4 or 5 times all entry in the table but in this time no...!!!!)

can any one help me?!!